Longest Word

#include<bits/stdc++.h>

using namespace std;

char s[103];

string s1,ans;

int main()
{
    int len,mx=0,i;

    while(scanf("%s",s))
    {
        if(strcmp(s,"E-N-D")==0)
        {
            break;
        }

        len = strlen(s);

        s1 = "";

        for(i=0; i<len; i++)
        {
            if(s[i]=='-'||(s[i]>='A' && s[i]<='Z')||(s[i]>='a' && s[i]<='z'))
            {
                if(isupper(s[i]))
                {
                    s1+=tolower(s[i]);
                }
                else if(s[i]=='-')
                {
                    s1+='-';
                }
                else
                {
                    s1+=s[i];
                }
            }
        }

        len = s1.length();

        if(len>mx)
        {
            mx = len;

            ans = s1;
        }
    }

    printf("%s\n",ans.c_str());

    return 0;
}